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config_test.go
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config_test.go
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package cnfg_test
import (
"fmt"
"os"
"strconv"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"golift.io/cnfg"
)
// TimeX uses two environment variables to multiply a duration.
type TimeX struct {
time.Duration
}
// This is a test to make sure our struct satisfies the interface.
var _ cnfg.ENVUnmarshaler = (*TimeX)(nil)
type AppConfig struct {
Name string `xml:"name"`
Special TimeX `xml:"in"`
}
func (t *TimeX) UnmarshalENV(tag, val string) error {
xTag := tag + "_X"
xString, ok := os.LookupEnv(xTag)
if !ok {
xString = "1"
}
multiplier, err := strconv.Atoi(xString)
if err != nil {
return fmt.Errorf("multiplier invalid %s: %w", xTag, err)
}
t.Duration, err = time.ParseDuration(val)
if err != nil {
return fmt.Errorf("duration invalid %s: %w", tag, err)
}
t.Duration *= time.Duration(multiplier)
return nil
}
// This simple example shows how you may use the ENVUnmarshaler interface.
// This shows how to use two environment variables to set one custom value.
func ExampleENVUnmarshaler() {
config := &AppConfig{}
os.Setenv("APP_IN", "5m")
os.Setenv("APP_IN_X", "10")
os.Setenv("APP_NAME", "myApp")
_, err := cnfg.UnmarshalENV(config, "APP")
if err != nil {
panic(err)
}
fmt.Printf("%s starts in %v", config.Name, config.Special)
// Output: myApp starts in 50m0s
}
func TestUnmarshalText(t *testing.T) {
t.Parallel()
d := cnfg.Duration{Duration: time.Minute + time.Second}
b, err := d.MarshalText()
require.NoError(t, err, "this method must not return an error")
assert.Equal(t, []byte("1m1s"), b)
}
func TestUnmarshalJSON(t *testing.T) {
t.Parallel()
d := cnfg.Duration{Duration: time.Minute + time.Hour}
b, err := d.MarshalJSON()
require.NoError(t, err, "this method must not return an error")
assert.Equal(t, []byte(`"1h1m0s"`), b)
}
func TestString(t *testing.T) {
t.Parallel()
testDur := cnfg.Duration{Duration: time.Hour + time.Minute}
assert.Equal(t, "1h1m", testDur.String())
testDur = cnfg.Duration{Duration: time.Hour}
assert.Equal(t, "1h", testDur.String())
}